﻿//Copyright (c) 2007-2009, Adolfo Marinucci
//All rights reserved.

//Redistribution and use in source and binary forms, with or without modification, 
//are permitted provided that the following conditions are met:
//
//* Redistributions of source code must retain the above copyright notice, 
//  this list of conditions and the following disclaimer.
//* Redistributions in binary form must reproduce the above copyright notice, 
//  this list of conditions and the following disclaimer in the documentation 
//  and/or other materials provided with the distribution.
//* Neither the name of Adolfo Marinucci nor the names of its contributors may 
//  be used to endorse or promote products derived from this software without 
//  specific prior written permission.
//
//THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 
//AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 
//WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 
//IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 
//INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 
//PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 
//HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 
//OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, 
//EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 

using System;
using System.Windows;
using System.Windows.Threading;



namespace AvalonDock
{

    /// <summary>
    /// Designates a Windows Presentation Foundation application model with added functionalities.
    /// </summary>
    class WpfApplication : Application
    {

        private static DispatcherOperationCallback exitFrameCallback = new
                                DispatcherOperationCallback(ExitFrame);



        /// <summary>
        /// Processes all UI messages currently in the message queue.
        /// </summary>
        public static void DoEvents()
        {

            // Create new nested message pump.
            DispatcherFrame nestedFrame = new DispatcherFrame();



            // Dispatch a callback to the current message queue, when getting called, 
            // this callback will end the nested message loop.
            // note that the priority of this callback should be lower than the that of UI event messages.
            DispatcherOperation exitOperation = Dispatcher.CurrentDispatcher.BeginInvoke(
                                                  DispatcherPriority.Background, exitFrameCallback, nestedFrame);



            // pump the nested message loop, the nested message loop will 
            // immediately process the messages left inside the message queue.
            Dispatcher.PushFrame(nestedFrame);



            // If the "exitFrame" callback doesn't get finished, Abort it.
            if (exitOperation.Status != DispatcherOperationStatus.Completed)
            {
                exitOperation.Abort();
            }

        }



        private static Object ExitFrame(Object state)
        {
            DispatcherFrame frame = state as DispatcherFrame;


            // Exit the nested message loop.
            frame.Continue = false;

            return null;

        }

    }

}

